Installing Accurate dual exhaust on ‘67 Barracuda

Glad you got it worked out.
It's always difficult mixing '67 and '68/9 setups.
The '67 tailpipes hung directly below the rail.
It's been a while but IIRC the '68s with tips hung offthe side of the rails.

Accurate has some of the parts correct but IIRC not the tailpipe hangers.
TTI has the correct tailpipe hangers but moves the muffler hangers so their pipes are not correct in that respect, and no specific '67 version to clear the gas tank strap.
Don's Custom Exhaust in Ohio prob has all the correct hangers and parts, but in your case with mix might not have helped any.